L2キャッシュメモリとキャッシュラインサイズを取得する。
#include <stdio.h>
void cpuid(int op, int *eax, int *ebx, int *ecx, int *edx){
__asm__ __volatile__ ("cpuid" : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx) : "a" (op) : "cc");
}
unsigned long get_cache_size(void) {
int eax, ebx, ecx, edx;
int size = 0;
cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if ((unsigned int)eax >= 0x80000006) {
cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
size = (ecx >> 16) & 0xffff;
}
return size * 1024;
}
unsigned long get_cache_linesize(void) {
int eax, ebx, ecx, edx;
int linesize = 0;
cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
if ((unsigned int)eax >= 0x80000006) {
cpuid(0x80000006, &eax, &ebx, &ecx, &edx);
linesize = (ecx >> 0) & 0xff;
}
return linesize;
}
int main(void) {
printf("L2 cache\t: %ld KB\n", get_cache_size() / 1024);
printf("L2 line cache\t: %ld B\n", get_cache_linesize());
return 0;
}